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A mongoose takes on the most infamous snake of all, the black mamba.

In Kruger National Park, a zebra is being attacked by a crocodile, when a group of hippos move in to protect their territory.

Grant and his friends go for a swim in the African Delta and have a surprise encounter with a giant crocodile.

Grizzly who are hooked on human food are destroyed or removed, Brutus tests bear-proof products.

The start of a beautiful relationship: Brutus and Jake meet for the very first time.

The story of how a bear can become your best friend… forever!

See how human activity has ruined our coastline.

A zebra foal and his father catch up with the herd on its way back to the rich green lands of the delta.

The mayfly is born, lives through middle-age, and then dies. All in the same day.

Monarch butterflies descend to the forest floor in order to mate and begin their migration north.

The final leg of the Monarch's journey is studded by the threatening hungry mouths of praying mantises.

Crew member talks about the plane they used to capture monarchs in flight.

Cameramen chase down the monarchs flying around a field.

Migration Ecologist tests the first test ever of an electronic tag on a monarch butterfly.

Red crab larvae hatch and head for dry land, covering Christmas Island's shores in delicate little crablings.